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Feline Coronavirus and FIP: An Essential Guide for Cat Owners

Feline Infectious Peritonitis (FIP) and Feline Coronavirus: Everything You Need to KnowCats are beloved pets that bring joy and comfort to many households. Unfortunately, they can also develop serious diseases that can be fatal if left undiagnosed and untreated.

Feline infectious peritonitis (FIP) and feline coronavirus are two such diseases that every cat owner should be aware of. In this article, we will explore the causes, signs, diagnosis, treatment, prognosis, and prevention of FIP and feline coronavirus, as well as the differences between feline and human coronavirus.

Feline Infectious Peritonitis (FIP):

FIP is a viral disease that affects cats. It is caused by a mutated form of feline coronavirus, which is common in cats.

Feline coronavirus usually causes mild gastrointestinal or respiratory symptoms in cats, but in rare cases, it can mutate and cause FIP. FIP is more common in younger cats and those with weakened immune systems.

Signs of FIP in cats:

FIP can manifest in two forms: wet and dry. Wet FIP is characterized by the accumulation of fluid in the abdomen or chest, while dry FIP is characterized by the formation of granulomas in various organs.

Both forms can cause non-specific signs such as loss of appetite, weight loss, lethargy, fever, and jaundice. The signs of FIP can be similar to those of many other diseases, which makes it difficult to diagnose.

Diagnosis and treatment:

Diagnosing FIP can be challenging, as its signs can mimic those of many other diseases. Several diagnostic tests, such as blood tests and imaging scans, can help confirm the presence of FIP.

A biopsy of the affected tissues is considered the gold standard for diagnosing FIP. Unfortunately, there is currently no cure for FIP.

Supportive care, such as fluid therapy and anti-inflammatory drugs, can help manage the symptoms and prolong the cat’s life. However, these measures are not always effective, and the prognosis for cats with FIP is generally grave.

Recently, a new drug called CL-Pro has shown some promising results in treating FIP. Another drug, remdesivir, is currently undergoing clinical trials to determine its efficacy against FIP.

Prognosis and prevention:

As mentioned above, the prognosis for cats with FIP is generally grave. Sadly, most cats diagnosed with FIP will eventually succumb to the disease.

Prevention strategies are therefore critical for reducing the incidence of FIP. One such strategy is to vaccinate cats against FIP.

While no vaccine is 100% effective, studies have shown that the FIP vaccine can reduce the risk of developing the disease. Other prevention strategies include keeping the cat’s environment clean and hygienic, avoiding overcrowding, and reducing stress.

Feline Coronavirus:

Feline coronavirus (FCoV) is a common viral disease in cats. It is estimated that up to 80% of cats may have been exposed to FCoV at some point in their lives.

FCoV is transmitted through contact with infected feces or mutual grooming. In rare cases, FCoV can also be transmitted from the mother cat to her kittens in utero.

Immune response:

When a cat is exposed to FCoV, its immune system produces antibodies to fight the virus. In most cases, the cat’s immune response is effective, and it does not develop any symptoms.

In some cases, however, the virus can mutate and cause FIP. The mutation occurs when the virus infects macrophages, which are immune cells that usually destroy viruses.

Instead, the virus survives in these macrophages, leading to persistent infection and chronic inflammation. Over time, this chronic inflammation can cause the formation of granulomas, which are characteristic of FIP.

Prevention and vaccine:

Preventing FCoV infection is important for reducing the risk of FIP. Prevention strategies include keeping the cat’s living environment clean and hygienic, avoiding overcrowding, and reducing stress.

Vaccination against FCoV is also available, although its efficacy is controversial. The American Association of Feline Practitioners recommends that the FCoV vaccine be used only in specific situations, such as in multicat households where exposure to the virus is high.

Differences from COVID-19:

Feline coronavirus is not related to the human coronavirus that causes COVID-19. Both viruses, however, belong to the same family of coronaviruses.

Feline coronavirus is not infectious to humans, and there is no evidence that humans can get COVID-19 from their pets. The disease caused by human coronavirus is also different from FIP, which is a disease unique to cats.


Feline infectious peritonitis and feline coronavirus are two serious diseases that can affect cats. Understanding their causes, signs, diagnosis, treatment, prognosis, and prevention is important for every cat owner.

While there is no cure for FIP, prevention strategies such as vaccination, maintaining a clean and hygienic environment, and reducing stress can help reduce the risk of infection. The FCoV vaccine may also be useful, although its efficacy is still uncertain.

By taking these preventative measures, we can help keep our feline friends healthy and happy for years to come. 3) Risk Factors:

Cats of all ages and backgrounds can contract FIP, but there are certain risk factors that can increase the likelihood of the disease developing.

Understanding what these risk factors are can help pet owners take preventative measures to protect their furry friends. Age and weak immune system:

FIP is more common in cats under the age of two and those with weak immune systems.

Kittens are particularly susceptible to FIP because their immune systems are not fully developed. Senior cats are also at risk because their immune systems may not function as well as they did when they were younger.

Cats with certain pre-existing conditions, such as feline leukemia virus (FeLV) or feline immunodeficiency virus (FIV), are also more vulnerable because these diseases weaken their immune systems. Multi-cat households and high-density facilities:

FIP is more likely to occur in multi-cat households or high-density facilities, such as shelters or catteries.

In these environments, cats are in close proximity to each other and have more opportunities to come into contact with one another’s bodily fluids, such as urine, saliva, and feces, which can transmit the virus. Stressful conditions, such as overcrowding or poor sanitation, can also increase the risk of FIP developing.

Recent stressors:

Stressful situations, such as moving or a major change in routine, can weaken a cat’s immune system and make it more susceptible to FIP. In some cases, the stressor may trigger the virus to mutate and develop into FIP.

Therefore, providing a comfortable and stress-free environment for cats is crucial in preventing FIP from developing. 4) Signs of FIP:

FIP is a disease that manifests differently in different cats.

Some cats may display strong symptoms, while others may show no signs at all. The complexity of the disease and the variation of symptoms can make it difficult to diagnose.

Here are some of the signs of FIP to look out for in cats:

Non-specific signs:

FIP can cause non-specific signs that are common to many other diseases. These can include lethargy, fever, loss of appetite, weight loss, and diarrhea.

These non-specific signs alone are not enough to confirm a diagnosis of FIP since they can occur for a variety of other reasons. Wet FIP:

Wet FIP, also known as effusive FIP, is characterized by the accumulation of fluid in the abdomen or chest.

Cats with wet FIP may experience difficulty breathing and have a swollen abdomen due to the buildup of fluid. Other signs may include lethargy, fever, and weight loss.

The fluid buildup can cause the cat’s breathing rate to increase, and they may have difficulty breathing. Some cats may also develop jaundice, which is a yellowing of the skin and eyes due to liver dysfunction.

Dry FIP:

Dry FIP, also known as non-effusive FIP, is characterized by the formation of granulomas in various organs, especially in the abdomen. These granulomas are clumps of inflammatory cells that can cause inflammation and tissue damage.

Cats with dry FIP may experience non-specific signs, such as lethargy and weight loss, as well as specific symptoms related to the affected organs. For example, if the granulomas are in the kidneys, the cat may develop kidney failure and experience increased thirst and urination.

If the granulomas are in the eyes, the cat may develop uveitis, which is inflammation of the eye that can cause pain, redness, and blurred vision. Conclusion:

FIP is a complex and often fatal disease that can affect any cat.

Understanding the risk factors and signs of FIP can help pet owners take preventative measures to protect their cats. If you suspect your cat may have FIP, it’s important to seek veterinary care as soon as possible.

While there is currently no cure for FIP, early diagnosis and treatment can help prolong the cat’s life and improve its quality of life. 5) Causes of FIP:

Feline infectious peritonitis (FIP) is caused by a mutated form of feline coronavirus.

Let’s take a closer look at how this virus causes FIP. Spread and replication of feline coronavirus:

Feline coronavirus (FCoV) is common in cats and is spread through contact with an infected cat’s bodily fluids, such as urine and feces.

Once the virus enters a cat’s body, it replicates primarily in the intestines and is then shed in the feces. Most cats who are infected with FCoV do not develop FIP.

Instead, the virus causes a mild gastrointestinal or respiratory illness that the cat’s immune system can usually fight off. Mutation and immune response:

In some cats, however, the FCoV mutates and transforms into the pathogenic strain that causes FIP.

The mutation occurs when the virus infects immune cells called macrophages. These macrophages are supposed to engulf and destroy foreign invaders like viruses.

However, in the case of FIP, the virus can actually survive and replicate within the macrophages, eventually leading to a chronic infection. As the immune system tries to fight off the persistent infection, chronic inflammation occurs, and the development of granulomas follows.

Wet vs. dry FIP:

The mutated FCoV can cause two distinct forms of FIP, wet and dry.

The wet form is characterized by the accumulation of fluid in the abdominal or thoracic cavity, leading to swelling and difficulty breathing. Blood vessels become leaky and allow fluid to escape into the tissues.

In contrast, the dry form of FIP does not produce excess fluid in the body cavity, but instead develops granulomas in various organs. These granulomas are clumps of inflammatory cells that cause tissue damage and inflammation.

6) Diagnosis of FIP:

Diagnosing FIP can be challenging because its signs can mimic those of other diseases. Here are some methods used to diagnose FIP.

Physical exam and diagnostic tests:

The vet will give your cat a thorough physical examination to look for signs of FIP. They may also perform diagnostic tests, such as bloodwork and x-rays, to determine if there are any abnormalities that may indicate FIP.

The vet may also analyze the chest fluid if the cat has wet FIP to confirm its diagnosis. Tissue sample and biopsy:

If your vet suspects that your cat has FIP, they may take a tissue sample to perform a biopsy.

A tissue sample can be taken from the affected organ or the granulomas. This is considered the gold standard for diagnosing FIP and can be helpful in differentiating FIP from other diseases, such as cancer.

However, biopsy results may not always be conclusive. In some cases, the vet may have to perform a postmortem examination to confirm the diagnosis if the cat has already passed away.


FIP is a complicated disease caused by a mutated form of feline coronavirus that can lead to severe symptoms and a grave prognosis. Understanding the causes and diagnosis of FIP can help identify and treat it early, providing cats with a better chance at a comfortable life.

While there is currently no cure for FIP, supportive care can help prolong a cat’s life and enhance its quality of life. Regular veterinary visits and preventative measures, such as vaccinating and reducing stress, can lower the risk of FIP.

7) Treatment of FIP:

Being a viral disease, feline infectious peritonitis (FIP) currently has no known cure. However, some treatments may help improve a cat’s quality of life.

Supportive care:

Supportive care is the most common treatment for FIP. It involves administering anti-inflammatory medications, removing excessive fluid in the body, and ensuring the cat’s nutritional needs are met.

Non-steroidal anti-inflammatory drugs such as meloxicam can be used for long-term management of inflammation and discomfort. In the wet form, the removal of fluid present in the body can alleviate the breathing difficulty that the cat experiences.

Often, a feeding tube or appetite stimulants are needed to maintain adequate nutrition and hydration. Experimental drugs:

Recently, two experimental drugs have shown some potential for treating FIP.

CL-Pro is a novel antiviral drug that has been shown to neutralize the FIP virus by inhibiting its replication in vitro. Remdesivir, an antiviral drug, has also shown some promise in treating FIP.

Both drugs are still undergoing clinical trials to determine their effectiveness against the disease in cats.


FIP is a fatal disease, and despite the best efforts of treatment, many cats with the disease ultimately succumb to it.

In some cases, euthanasia may be the most humane option for a cat suffering from FIP. This is a difficult decision to make, but sometimes it is the right choice to prevent further suffering.

8) FIP Prognosis:

FIP is generally considered a fatal disease, with a reported 90 percent mortality rate in affected cats. Let’s look at the prognosis for cats with FIP in more detail.

Survival rate:

Cats with wet FIP tend to have a shorter lifespan than cats with dry FIP. The life expectancy of cats with wet FIP can range from a few days to a few weeks.

Cats with dry FIP have a better chance of survival, with an average lifespan of several months. However, those cats will eventually succumb to the disease.

Long-term care:

There is little possibility of long-term care for FIP, as it is a fatal disease. The main aim is to provide supportive care for cats to maintain their quality of life for as long as possible.

Unfortunately, the disease’s progression is unpredictable, and cats with FIP can worsen suddenly. Research and potential cure:

Veterinary researchers are actively exploring ways to develop treatments and eventually, a cure for FIP.

They are investigating new drugs and therapies that use monoclonal antibodies to target and neutralize FIP virus particles in cats. Another immunotherapy drug, GS-441524, has shown promising results in clinical trials.

While there is still a long way to go before a cure is confirmed, these developments provide hope for cat owners and veterinary professionals. It’s essential to note that these treatments are still in their

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